Suction Nozzle Imaging Timing for Component Mounting
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Solution Overview
Problem
Existing component mounting devices fail to reliably check the state of electronic components during the mounting process, particularly in detecting drop-off or issues with suction nozzles, due to inadequate imaging timing and throughput reduction.
Innovation Solution
A component mounting device with a nozzle holder that can turn and move horizontally, featuring suction nozzles arranged along a circumference, a camera for capturing side images of ascending nozzles, and parameter storage for determining optimal imaging timing based on descent start timing and imaging duration, ensuring imaging is completed immediately before the nozzle starts descent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If imaging is performed after suction nozzle stops at work position, then image capture reliability is improved, but mounting throughput is reduced due to unnecessary delay
Solution Approach 1:
The camera captures images of the suction nozzle at a position before the work position (one pitch ahead) during the rotation process, rather than waiting for the nozzle to stop at the work position. This preliminary imaging action allows drop-off detection to occur before mounting, eliminating the need to wait for imaging completion and maintaining mounting throughput while ensuring reliability through early detection capability
2Reliability
If imaging is performed immediately before mounting, then drop-off detection reliability is improved, but imaging time causes delay in mounting operation
Solution Approach 1:
The system performs imaging at a position one pitch ahead of the work position during the suction nozzle's rotation, capturing images before the nozzle reaches the mounting position. This preliminary action allows the imaging process to complete without interfering with the subsequent mounting operation timing, eliminating delays while maintaining high drop-off detection reliability
Solution Approach 2:
The imaging operation is integrated into the continuous rotation movement of the suction nozzle without requiring the nozzle to stop or wait for imaging completion. The camera captures images during the rotation process, allowing the mounting operation to proceed continuously without interruption or delay
3Measurement precision
If imaging is performed at stopped state, then image quality is improved, but detection capability after rotation is lost
Solution Approach 1:
The camera captures images of the suction nozzle at a position before the work position during the rotation process, rather than waiting for the nozzle to stop at the work position. This preliminary imaging action allows drop-off detection to occur before mounting, eliminating the need to wait for imaging completion and maintaining mounting throughput while ensuring reliability through early detection capability
Data Source
AI summary
After one suction nozzle turns from one arrangement pitch ahead of a work position toward the work position and immediately before the suction nozzle starts descent at the work position, an image of a side portion of the suction nozzle is captured. Parameters are used for controlling the imaging operation. The parameters include descent start timing when each of the suction nozzles starts descent during mounting of an electronic component, and data required for determining an imaging time necessary from when a camera starts imaging of the suction nozzle until the camera ends the imaging. Imaging is completed immediately before the one suction nozzle starts descent at the work position.